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Transonic Combustion - A Novel Injection-Ignition System for Improved Gasoline Engine Efficiency
Technical Paper
2010-01-2110
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Spark ignition gasoline engine efficiency is limited by a number
of factors; these include the pumping losses that result from
throttling for load control, spark ignition and the slow burn rates
that result in poor combustion phasing and a compression ratio
limited by detonation of fuel. A new combustion process has been
developed based on the patented concept of injection-ignition known
as Transonic Combustion or TSCi™; this combustion process is
based on the direct injection of fuel into the cylinder as a
supercritical fluid. Supercritical fuel achieves rapid mixing with
the contents of the cylinder and after a short delay period
spontaneous ignition occurs at multiple locations. Multiple
ignition sites and rapid combustion combine to result in high rates
of heat release and high cycle efficiency. The injection-ignition
process is independent from the overall air/fuel ratio contained in
the cylinder and thus allows the engine to operate un-throttled.
Additionally, the stratified nature of the charge under part load
conditions reduces heat loss to the surrounding surfaces, resulting
in further efficiency improvements. The short combustion delay
angles allow for the injection timing to be such that the ignition
and combustion events take place after TDC. This late injection
timing results in a fundamental advantage in that all work
resulting from heat release produces positive work on the piston.
Other advantages are the elimination of droplet burning and
increased combustion stability that results from multiple ignition
sources.
Engine test results are presented over a range of speed, load
and operating conditions to show fuel consumption, emission and
combustion characteristics from initial injector and combustion
system designs. The results are correlated with thermo-dynamic
modeling and comparisons are made with contemporary engines.
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Authors
Citation
De Boer, C., Chang, J., and Shetty, S., "Transonic Combustion - A Novel Injection-Ignition System for Improved Gasoline Engine Efficiency," SAE Technical Paper 2010-01-2110, 2010, https://doi.org/10.4271/2010-01-2110.Also In
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